ruins of the ancient thermal baths of diocletianopolis, town of hisarya, bulgaria

ancient archeological archeology architecture baths brick bulgaria byzantine destinations diocletianopolis diokletian diokletianopolis europe fortification fortress gora hisar hisaria hisarya hissar hissaria hissarya historical landmark mineral mountain outdoor park plovdiv region remains resort roman ruins sights sightseeing spa sredna stone structure the thermal thrace tourism town vacation wall water